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ddl: defining the placement rule of a leader requires REPLICAS option #20813

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merged 10 commits into from
Nov 5, 2020
Merged

ddl: defining the placement rule of a leader requires REPLICAS option #20813

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0929a61
ddl: defining the placement rule of a leader requires `REPLICAS` option
TszKitLo40 Nov 3, 2020
cc9448d
fix unit test.
TszKitLo40 Nov 4, 2020
383f42a
nitpick.
TszKitLo40 Nov 4, 2020
7751a09
Update ddl/placement_sql_test.go
TszKitLo40 Nov 4, 2020
5277318
Merge branch 'master' into fix20751
AilinKid Nov 4, 2020
de17f58
Merge branch 'master' into fix20751
AilinKid Nov 4, 2020
f38dd4c
Merge branch 'master' into fix20751
ti-srebot Nov 4, 2020
7d0899e
Add constrait of replicas when the role is leader.
TszKitLo40 Nov 4, 2020
a3a8837
Merge branch 'fix20751' of https://github.com/TszKitLo40/tidb into fi…
TszKitLo40 Nov 4, 2020
7bb93cc
Merge branch 'master' into fix20751
ti-srebot Nov 4, 2020
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3 changes: 3 additions & 0 deletions ddl/ddl_api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5810,6 +5810,9 @@ func buildPlacementSpecs(bundle *placement.Bundle, specs []*ast.PlacementSpec) (
case ast.PlacementRoleFollower:
role = placement.Follower
case ast.PlacementRoleLeader:
if spec.Replicas == 0 {
spec.Replicas = 1
}
Comment on lines +5849 to +5851
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What if the user sets it to 0 explicitly?
e.g. leader=role replicas=0

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This case has been treated in the parser.

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why not just throw "Invalid placement option REPLICAS, it is should be identified"? @djshow832

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The number of leaders can be only 1. It's unnecessary to declare it.

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ok

role = placement.Leader
case ast.PlacementRoleLearner:
role = placement.Learner
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6 changes: 6 additions & 0 deletions ddl/placement_sql_test.go
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Expand Up @@ -274,6 +274,12 @@ add placement policy
role=leader
replicas=3`)
c.Assert(ddl.ErrPartitionMgmtOnNonpartitioned.Equal(err), IsTrue)

// issue 20751
tk.MustExec("drop table if exists t_part_pk_id")
tk.MustExec("create TABLE t_part_pk_id (c1 int,c2 int) partition by range(c1 div c2 ) (partition p0 values less than (2))")
tk.MustExec(`alter table t_part_pk_id alter partition p0 add placement policy constraints='["+host=store1"]' role=leader;`)
tk.MustExec("drop table t_part_pk_id")
}

func (s *testDBSuite1) TestPlacementPolicyCache(c *C) {
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